Across
- 1. all natural numbers including zero
- 3. the set of rational numbers together with the set of irrational numbers
- 5. positive and negative whole numbers
Down
- 2. all numbers used for counting objects
- 3. numbers that can be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero
- 4. numbers that can't be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero